Seven segment displays NOT ICM7219!

Seipy

I have a very large display consisting of 26 large 7 segment displays. Because of the need I am using a seperate BCD to seven segment drivers. I do not event want to hear about the ICM7219 UGH!

the stamp will recieve a string of 26 single digit numbers via rs232.·for example:12345678901234567890123456

I want to seperate each number into a nibble so I will end up with 26 nibbles of info.
So according the·the string example above the nibble would be populated with the following:
nibble 1 0001
nibble 2 0010
nibble·3 0011 and so on to
nibble 26 0110

I will have four outputs that feed the data to the BCD to seven segment displays.
I want·to·output nibble one (0001) on the outputs, wait, put nibble two on the outputs (0010) and so on. It will scroll through all 26 and then restart back to nibble 0 and go again.

how do I get the binary data in a nibble to turn on the outputs?
Thanks,
Dave Seip

Seipy

I had built this scoreboard using a obsolete Programmable logic controller. I now want a stamp to run it. I plan on using the ICM7212 and not the 7219. Your help would be greatly appreciated as the PLC has died.
Thanks,
Dave Seip

Jon Williams

One of the problems you're going to face is variable space -- the BASIC Stamp only has 26 bytes for variables so you can't hold that all in a string. If you use a BS2p or BS2pe, you can buffer the string into the Scratcpad RAM.

Conversion is easy: The ASCII code for "0" is 48, so you can subtract 48 from an ASCII digit to get its decimal value.

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Jon Williams
Applications Engineer, Parallax
Dallas Office